The efficiency depends on the query size relative to the data distribution. A small query in a sparse region prunes almost everything. A query that covers the whole space prunes nothing (because every node overlaps), degenerating to a brute-force scan. The quadtree gives you the most benefit when your queries are spatially local, which is exactly the common case for map applications, game physics, and spatial databases.
if (bucketSize == 0) continue;，更多细节参见51吃瓜
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Watch MotoGP for free from anywhere in the world，更多细节参见safew官方版本下载
他從不召開記者會，也不接受採訪——即便是面對受到嚴格控制的中國媒體。
第三十八条 县级以上人民政府应当加强行政执法监督工作保障，将行政执法监督工作所需经费列入本级预算。